Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
diff --git a/include/linux/prio_tree.h b/include/linux/prio_tree.h
new file mode 100644
index 0000000..db04abb
--- /dev/null
+++ b/include/linux/prio_tree.h
@@ -0,0 +1,120 @@
+#ifndef _LINUX_PRIO_TREE_H
+#define _LINUX_PRIO_TREE_H
+
+/*
+ * K&R 2nd ed. A8.3 somewhat obliquely hints that initial sequences of struct
+ * fields with identical types should end up at the same location. We'll use
+ * this until we can scrap struct raw_prio_tree_node.
+ *
+ * Note: all this could be done more elegantly by using unnamed union/struct
+ * fields. However, gcc 2.95.3 and apparently also gcc 3.0.4 don't support this
+ * language extension.
+ */
+
+struct raw_prio_tree_node {
+ struct prio_tree_node *left;
+ struct prio_tree_node *right;
+ struct prio_tree_node *parent;
+};
+
+struct prio_tree_node {
+ struct prio_tree_node *left;
+ struct prio_tree_node *right;
+ struct prio_tree_node *parent;
+ unsigned long start;
+ unsigned long last; /* last location _in_ interval */
+};
+
+struct prio_tree_root {
+ struct prio_tree_node *prio_tree_node;
+ unsigned short index_bits;
+ unsigned short raw;
+ /*
+ * 0: nodes are of type struct prio_tree_node
+ * 1: nodes are of type raw_prio_tree_node
+ */
+};
+
+struct prio_tree_iter {
+ struct prio_tree_node *cur;
+ unsigned long mask;
+ unsigned long value;
+ int size_level;
+
+ struct prio_tree_root *root;
+ pgoff_t r_index;
+ pgoff_t h_index;
+};
+
+static inline void prio_tree_iter_init(struct prio_tree_iter *iter,
+ struct prio_tree_root *root, pgoff_t r_index, pgoff_t h_index)
+{
+ iter->root = root;
+ iter->r_index = r_index;
+ iter->h_index = h_index;
+ iter->cur = NULL;
+}
+
+#define __INIT_PRIO_TREE_ROOT(ptr, _raw) \
+do { \
+ (ptr)->prio_tree_node = NULL; \
+ (ptr)->index_bits = 1; \
+ (ptr)->raw = (_raw); \
+} while (0)
+
+#define INIT_PRIO_TREE_ROOT(ptr) __INIT_PRIO_TREE_ROOT(ptr, 0)
+#define INIT_RAW_PRIO_TREE_ROOT(ptr) __INIT_PRIO_TREE_ROOT(ptr, 1)
+
+#define INIT_PRIO_TREE_NODE(ptr) \
+do { \
+ (ptr)->left = (ptr)->right = (ptr)->parent = (ptr); \
+} while (0)
+
+#define INIT_PRIO_TREE_ITER(ptr) \
+do { \
+ (ptr)->cur = NULL; \
+ (ptr)->mask = 0UL; \
+ (ptr)->value = 0UL; \
+ (ptr)->size_level = 0; \
+} while (0)
+
+#define prio_tree_entry(ptr, type, member) \
+ ((type *)((char *)(ptr)-(unsigned long)(&((type *)0)->member)))
+
+static inline int prio_tree_empty(const struct prio_tree_root *root)
+{
+ return root->prio_tree_node == NULL;
+}
+
+static inline int prio_tree_root(const struct prio_tree_node *node)
+{
+ return node->parent == node;
+}
+
+static inline int prio_tree_left_empty(const struct prio_tree_node *node)
+{
+ return node->left == node;
+}
+
+static inline int prio_tree_right_empty(const struct prio_tree_node *node)
+{
+ return node->right == node;
+}
+
+
+struct prio_tree_node *prio_tree_replace(struct prio_tree_root *root,
+ struct prio_tree_node *old, struct prio_tree_node *node);
+struct prio_tree_node *prio_tree_insert(struct prio_tree_root *root,
+ struct prio_tree_node *node);
+void prio_tree_remove(struct prio_tree_root *root, struct prio_tree_node *node);
+struct prio_tree_node *prio_tree_next(struct prio_tree_iter *iter);
+
+#define raw_prio_tree_replace(root, old, node) \
+ prio_tree_replace(root, (struct prio_tree_node *) (old), \
+ (struct prio_tree_node *) (node))
+#define raw_prio_tree_insert(root, node) \
+ prio_tree_insert(root, (struct prio_tree_node *) (node))
+#define raw_prio_tree_remove(root, node) \
+ prio_tree_remove(root, (struct prio_tree_node *) (node))
+
+#endif /* _LINUX_PRIO_TREE_H */